Valve arrangement for the delivery of fluids

Abstract

A valve arrangement includes a valve housing and a closing element movably arranged within the housing. The housing has a cylindrical bore a lateral inlet opening, an axial outlet opening, and a valve seat arranged axially at a distance away from the inlet opening. The closing element includes a sealing section adapted to seat against a valve seat so as to block fluid flow through the outlet, and tapered portion which defines a rotationally symmetrical circumferential distribution space between itself and the bore.

What is claimed is: 
     
       1. A valve arrangement for delivering highly viscous fluids, said valve arrangement comprising a valve housing having a cylindrical bore, a lateral inlet opening, an axial outlet opening, and a valve seat surrounding the outlet opening; and   a closing element movably arranged within the bore, said closing element having:   a cylindrical section which is sealingly guided in said cylindrical bore,   a sealing section adapted to seat against said valve seat so as to block fluid flow through said outlet, and   a neck portion with a doubly tapered outer surface, said tapered outer surface being sized so as to define a rotationally symmetrical circumferential distribution space between said cylindrical bore and said tapered outer surface,   said distribution space extending axially between the valve seat and the inlet opening and being in communication with the inlet opening when the valve is in a closed configuration, and having a radial width which continuously diminishes, from a point with a maximum radial width towards a point of minimum radial width at the sealing section, said radial width remaining constant when the sealing section is axially moved within said bore.   
     
     
       2. A valve arrangement according to claim 1, characterized in that the distribution space (12) is formed by two cone sections (20a, 20b) standing on one another. 
     
     
       3. A valve arrangement according to claim 1, characterized in that the distribution space (12) is formed by a curved surface of revolution (21). 
     
     
       4. A valve arrangement for highly viscous fluids, said valve comprising: a housing having a cylindrical bore, a lateral inlet intersecting said bore and a coaxial outlet at one end of said bore, said outlet having a diameter less than that of the bore and being surrounded by a shoulder forming a flat annular seat having a surface perpendicular to said bore and   a unitary closing element having   (a) at one end a cylindrical portion sized to slide sealingly within said bore,   (b) at the other end a sealing portion forming an annular gap with said bore and adapted to seal against said flat annular seat, and   (c) a neck portion extending from said cylindrical portion to said sealing portion, said neck portion being of continuously varying diameter, thus defining a continuously varying radial clearance between the closing element and the housing, said radial clearance diminishing continuously from a point of maximum clearance, where the neck diameter is a minimum, to a point of minimum clearance at said sealing portion, whereby said fluid exits said outlet in an axial direction with no substantial radial component.